Asco 8220 Series Installation & Maintenance Instructions

Brand: Asco

Model: 8220 Series

Type: Installation & Maintenance Instructions

Asco 8220 Series valves are designed for steam or hot water service and are suitable for various industrial applications. These 2-way normally closed, internal pilot-operated solenoid valves ensure reliable operation with a minimum operating pressure differential of 5 psi. Constructed from forged brass with stainless steel internal parts, they offer durability and resistance to corrosion. The valves come with ethylene propylene or TEFLON elastomers for enhanced performance and compatibility with different fluids.

Page 1 of 3

E208523---04/10

ASCO Valves

EASCO Valve, Inc.R 50 Hanover Road, Florham Park, New Jersey 07932 www.ascovalve.com

Installation & Maintenance Instructions

SERIES

I&M No.V9571R3

8220

2--WAY INTERNAL PILOT--OPERATED SOLENOID VALVES

NORMALLY CLOSED OPERATION — STEAM OR HOT WATER SERVICE

3/8I 1/2I 3/4I NPT

NOTICE: See separate solenoid installation and

maintenance instructions for information on: Wiring,

Solenoid Temperature, Cause of Improper Operation, Coil

or Solenoid Replacement.

DESCRIPTION

Series 8220 valves are 2---way normally closed, internal pilot

operated solenoid valves designed for steam or hot water

service. These valves are made of forged brass with stainless

steel internal parts and ethylene propylene, and/or

TEFLON* elastomers, dependi ng upon construction.

Series 8220 valves may be provided with a gene ral purpose

or explosionproof solenoid enclosure.

OPERATION

Normally Closed: Valve is closed when solenoid is

de---energized; open when energized.

IMPORTANT: Minimum operating pressure differential

required is 5 psi.

INSTALLATION

Check nameplate for correct catalog number, pressure,

voltage, frequency, and service. Never apply incompatible

fluids or exceed pressure rating of the valve. Installation and

valve maintenance to be performed by qualified personnel.

CAUTION: Maximum operating pressure

differentials are based on temperature--related

material limitations. Therefore, do not use valves with

a steam source of higher pressure than the nameplate

maximum operating pressure differential. Also do not

use a pressure reducing valve to reduce steam source

to rated pressure because this would result in

superheated steam of excessive temperature entering

the valve.

Temperature Limitations And Pressure Ratings

For maximum valve ambient and fluid temperatures, refer

to chart below. Check nameplate for maximum pressure

rating.

Maximum Pressure

Rating psi & Service

(Maximum Operating

Pressure Differential)

Wat t

Rating

Coil

Class

Max.Amb.

Te m p . _F

Max.Fluid

Te m p . _F

50 Steam

150 Hot Water 6.1

6.1

32---125_F

( 0 --- 5 2 _C)

{

300_F

(149_C)

32---210_F

( 0 --- 9 9 _C)

125 Steam

150 Hot Water

10.1

32---140_F

( 0 --- 6 0 _C)

353_F

(178_C)

32---210_F

( 0 --- 9 9 _C)

32---125_F

( 0 --- 5 2 _C)

{

32---140_F

( 0 --- 6 0 _C)

{ Note: Maximumambient temperaturefor valvessupplied

withClassH,ACcoil(PrefixHT)is140_.

Future Service Considerations

Provision should be made for performing seat leakage,

external leakage, and operational tests on the valve with a

nonhazardous, noncombustible fluid after disassembly and

reassembly.

Positioning

This valve i s designed to perform properly when mounted i n

any position. However, for optimum life and performance,

the solenoid should be mounted vertically and upright to

reduce the possibility of foreign matter accumulating in the

solenoid base sub---assembly area.

Piping

Connect piping or tubing to valve according to markings on

valve body.

CAUTION: This valve is equipped with ethylene pro-

pylene elastomers which can be attacked by oils and

greases. Wipe the pipe threads clean of cutting oils.

Apply pipe compound sparingly to male pipe threa ds only.

If applied t o valve threads, the compound may enter the

valveandcauseoperationaldifficulty.Avoidpipestrainby

properly supporting and aligning piping. When tightening

thepipe,donotusevalveorsolenoidasalever.Locate

wrenches applied to va lve body or piping as close as possible

to connection point.

CAUTION: To protect the solenoid valve, install a

strainer or filter, suitable for the service involved, in the

inlet side as close to the valve as possible. Clean

periodically depending on service conditions. See

ASCO Series 8600, 8601 and 8602 for strainers.

MAINTENANCE

WARNING: To prevent the possibility of

death, serious injury or property damage,

turn off electrical power, depressurize valve,

and vent fluid to a safe area before servicing

the valve.

Note: It is not necessary to remove the valve from the

pipeline for repairs.

Cleaning

All solenoid valves should be cleaned periodically. The time

between cleanings will vary depending on the medium and

service conditions. In general, if the voltage to the coil is

correct, sluggish valve operation, excessive noise or leakage

will indicate that cleaning is required. In the extreme case,

faulty valve operation will occur and the valve may fail to

open or close. Clean strainer or filter when cleaning the

valve.

*DuPont Co. Registered Trademark

Page 2 of 3 I&M No.V9571R3

EASCO Valve, Inc.R 50 Hanover Road, Florham Park, New Jersey 07932 www.ascovalve.com

Preventive Maintenance

S Keepthemediumflowingthroughthevalveasfreefrom

dirt and foreign material as possible.

S Periodic exercise of the valve should be considered if

ambi ent or fluid conditions are such that corrosion,

elastomer degradation, fluid contamination build up, or

other conditions that could impede solenoid valve

shifting are possible. The actual frequency of exerci se

necessary will depend on specific operating conditions.

A successful operating history is the best indication of

a proper interval between exercise cycles.

S Depending on the medium and service conditions,

periodic inspectionof internalvalve parts for damageor

excessi ve wear is recommended. Thoroughly clean all

parts. If parts are worn or damaged, install a complete

ASCO Rebuild Kit.

Causes of Improper Operation

Incorrect Pressure: Check valve pressure. Pressure to

valve must be within range specified on nameplate.

S Excessive Leakage: Disassemb le valve and clean all parts.

If parts are worn or damaged, install a complete A SCO

Reb uild Kit.

Valve Disassembly

Note: Check pressure rating on nameplate to determine

valve construction. Refer to Figure 1.

1. Disassemble valve in an orderly fashion using exploded

view for identification and placement of parts.

2. Remove solenoid, see separate instructions.

3. Unscrew solenoid base sub---assembly and remove core

assembly with core spring at tached (external core spring

construction) or core spring and diaphragm spring

(inte rnal core spring construction), body gasket, dia-

phragm retainer, diaphragm assembly, diaphragm sup-

port plate and strainer.

4. All parts are now accessible to clean or replace. If parts

are worn or damaged, i nstall a complete ASCO Rebuild

kit.

Valve Reassembly

1. Reassemble valve using exploded views for

identification and placement of parts.

2. Lubricate body gasket with DOW CORNINGr 200

Fluid lubricant or an equivalent high---grade silicone

fluid.

3. Position the following parts in the valve body: strainer,

diaphragm support plate (with center diameter down),

diaphragm assembly, diaphragm retainer (with outside

perimeter flange down) and body gasket.

4. Replace core assembly with core spring attached

(ext ernal core spring construction) or core spring and

diaphragm spring (internal core spring construction),

and solenoid base sub---assembly and torque to 480 ± 48

in---lbs [7,3 ± 1,7 Nm].

5. Install solenoid, see separate instructions and make

electrical hookup.

WARNING: To prevent the possibility of

death, serious injury or property damage,

check valve for proper operation before

returning to service. Also perform internal

seat and external leakage tests with a non-

hazardous, noncombustible fluid.

6. Restore line pressure and electrical power supply to

valve.

7. After maintenance is completed, operate the valve a

few ti mes to be sure of proper operation. A metallic

click indicates the solenoid is operating.

ORDERING INFORMATION FOR

ASCO REBUILD KITS

Parts marked with an asterisk (*) in the exploded view are

suppli ed in Rebuild Kits. When Ordering Rebuild Kits for

ASCO valves, order the Rebuild Kit number stamped on the

valve nameplate. If the number of the kit is not visible, order

by indicating the number of kits required, and the Catalog

Number and Serial Number of the valve(s) for which they

are intended.

Page 3 of 3 I&M No.V9571R3

EASCO Valve, Inc.R 50 Hanover Road, Florham Park, New Jersey 07932 www.ascovalve.com

To r q u e C h a r t

Part Name Torque Value Inch---Pounds Torque Value Newton---Meters

Solenoid sub ---assembly 480 ± 60 54,2 ± 6,8

diaphragm assembly

diaphragm

support plate

diaphragm retainer

core assembly

body gasket

solenoid base sub---assembly

Indicates parts supplied

in Rebuild Kit

valve body

strainer

core spring

diaphragm support plate

valve body

P artial view showing correct orientation

of diaphragm support plate being

installed into valve body

Figure 1. Series 8220 valve without solenoid.

diaphragm spring

external core spring construction

(8220G403, 8220G406, 8220G409)

internal core spring construction

(8220G401, 8220G404, 8220G407)

core spring

core assembly

strainer

Asco 8220 Series Installation & Maintenance Instructions

Asco 8220 Series Installation & Maintenance Instructions

Asco 8220 Series Installation & Maintenance Instructions

Related papers

Other documents